"Gwyneth's sorted out everything from finances to hooking her up with her trainer. She has also forced her to swear off sex for a year, saying men distract her focus," a source said.
The two friends have been spotted together regularly in the past year and Paltrow, 40, previously hoped to find the perfect man for her bubbly friend, reported Sun Online.
"Gwyneth is a nurturer. Cameron is bummed about being single, so Gwyneth sees her as a project. She's trying to set her up with guys!" the source added.
Diaz has previously dated several famous men, including Justin Timberlake, Criss Angel, baseball player Alex Rodriguez and Jared Leto.
While Paltrow is married to Coldplay frontman Chris Martin and the couple have two children, daughter Apple, eight, and six-year-old son Moses.
